'Be Strong' in the Bible

"Thus sayeth the LORD of Hosts: let your hands be strong, ye that now hear these words by the mouth of the prophets which be in these days that the foundation is laid upon the LORD of Hosts' house, that the temple may be builded.

And it shall come to pass, that like as ye were a curse among the Heathen, O ye house of Judah and ye house of Israel: Even so will I deliver you, that ye shall be a blessing. Fear not, but let your hands be strong.